Combined rule and square.



Patented Aug. 21, 1911- lll'pllllililllnilql qllll lllllll 6...

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A TTORNLY EDWIN GROSSMANN, OF TI-IRALL, TEXAS.

COMBINED RULE AND SQUARE.

Specification of Letters Patent.

Patented Au 21, 1917.

Application filed October 28, 1916. Serial No. 128,225.

To all whom it may concern:

Be it known that I, EDWIN GROssMANN, a citizen of the United States, residing at Thrall, in the county of Williamson and State of Texas, have invented certain new and useful Improvements in Combined Rules and Squares, of which the following is a specification.

This invention relates to improvements in combined rules and squares and particularly to a foldable foot rule composed of a plurality of sections each of which is formed with a narrow beveled end wherein a transverse groove is formed and an end having a curved tongue adapted to fit in the grooved end of the adjacent rule section whereby the rule sections are releasably locked in extended position; when one rule section is turned at right angles to its adjacent section the tongue at the end of the one section projects over the beveled end of the adjacent sections and so the said sections are releasably locked at right angles to each other. It is thus possible to form a rigid straight rule or one or more rigid squares with my improved device. Referring to the drawing which forms a part of'this specification,

Figure 1 is a side elevation of my improved device as a square.

Fig. 2 is a top plan view of the device as a square.

Fig. 3 is an enlarged fragmentary view of Fig. 1.

Fig. l is an enlarged fragmentary plan view of Fig. 2. I

i Fig. 5 is a section taken on line 5-5 of Fig. 4.

Fig. 6 is a section taken on line 66 of s Fig. 7 is a view lnelevation of the devlce folded.

Like reference characters denote corresponding parts throughout the several views.

My combined rule and square is formed of a plurality of counterpart sections 1 each of which terminates at one end in a tongue 2 bent out of the plane of the body portion of the section, and at the opposite end in a beveled and contracted portion 3 which is divided from the body portion of the section by the transverse groove e adapted, when the sections are alined with each other, to receive the tongue 2 of the adjacent section. The several sections are connected to each other by pivots 5. It is readily seen that when the rule sections lie in alinement with each other or in extended position with the several tongues 2 disposed in the several grooves 4 a rigid straight rule is formed as it will require some little effort to move one section into a position at an angle to its adjacent section.

In Fig. 4 two rule sections are shown at right angles to each other and in this position the tongue 2 of the one section projects over the lateral edge of the contracted end of the adjacent section and so forms a means for yieldingly retaining the sections in their respective positions thus forming a rigid square of the device. It is obvious that a rigid square may be formed by any two adjacent sections of the device.

What is claimed is In a combined rule and square a plurality of duplicate sections pivotally connected, a tongue formed at one end of each section and a beveled contracted portion formed at the opposite end of each section, each of said contracted portions being divided from the body of the section by a transverse groove.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two subscribing witnesses.

EDWIN GROSSMANN.

Witnesses: V

J on Yoi-rnnsrnnnn, Josnr SCI-IIFFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

